In time the electric lock switches wear off until they are no longer are visible. Installing new lock switches is tough. It is very easy to damage the clips that hold them in place.  These stickers are easy to apply; no part of your door needs to be removed.  Dimensionally they are slightly smaller than the flat area where the original markings are printed.

"when installing new switches, it is easy to break the  retaining tabs that hold the switches in their correct position in the  plastic door handle plate. These lock stickers take all the hassle and work out of the job."